evaluate: lim h tends to 0 (under root(x+h)-under root (x))/ h

limh0x+h-xhSo limh0x+h-xh×x+h+xx+h+x=limh0x+h-xh×(x+h+x)=limh01x+h+x ( put h = 0, as indeterminate form is removed)=12x (ans)

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